Re: [quicwg/base-drafts] does version negotiation packet format need to be locked across versions (#569)

[mirjak <[e-mail]>]

Yes, I agree that this is still unclear. For version negotiation you need to fix the header format bit, the header type field, the whole version negotiation header incl. it's type and either the version field of the long header or also the client initial packet type and the version field in that header as well as the mechanism that all quic connection have to start with a client initial. But probably it makes sense and is just easier for version negotiation to fix the whole long header (which mean future packets type in new version may extend the long header but all long header packets need to have at least these fields). If you want to make it possible to allow network nodes to use the connection or packet number in short header packets (even if they didn't see the handshake and therefore the used version), you of course also have to fix that in the short header as well. Which basically means all headers are fixed and future version can only add additional information. From my side, i think that's okay.

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